excessive farting,heart burn and stomach pain.

Hello Doctor
This enquiry is for my mother. She is about 55 years. She has BP and cholestrol which is under control by medicines. Her diet is very less..comprising of vegetables..rice and wheat...still she is putting on weight continuously.. she also exercises but still no help. Now for the last 3/4 years she has been farting a lot. If she doesnt eat anything..not much problem... but even a little of food intake triggers fart problems... Also for the last few days she has been complaining of heart burn as well. At times stomach pain also exists.. Could you please suggest what could be the problem? Is this a serious problem? Please help and advice.